The most reasonably priced component used on the Ds7 1972 Usa Crank - Piston is the Circlip (137-11634-00).
The Ds7 1972 Usa Crank - Piston consists of thirty-two pieces with the Crank Assy being the most expensive.
A sample from the products for the Crank - Piston include: Circlip (137-11634-00), Bearing, Needle (24x), Rod, Connecting, Oil Seal (40x62x10-278).